XM car install

I have a Sony head unit (CDX-F7715X) and a Sony iPod adapter currently installed in my car. I want to add my old Terk XM Direct system back in as I miss my XM radio. Does anyone know where (other than fleabay) I can find a Sony XA-C30 source adapter? It's discontinued, Crutchfield and Sony don't carry it anymory.

Already tried the XA-C40. It's not completely compatible with the head unit. I tracked down a C30 last night, though. Should have it some time next week.